java get the longest string in enum

Question

I would like to find the longest String within a Java Enum. What is the best way to do this? I havent been working to much with Enums so any suggestion is welcome. These are my enums

 public enum DOMAIN_LANGUAGES {
    ENG, SWE;

    public static List<DOMAIN_LANGUAGES> getDomainLanguages(){
        List<DOMAIN_LANGUAGES> languages = new ArrayList<DOMAIN_LANGUAGES>();
        languages.add(ENG);
        languages.add(SWE);
        return languages;
    }
}

public enum DOMAIN_STATE {
    LIVE,
    PENDING_RENEWAL,
    PENDING_TRANSFER_OUT,
}

EDIT:

I didnt define this question very well and hence i edit it. What I whant from my two enums is a function that takes any of the two kind of enums i have defined as and finds the longest literal. So in the DOMAIN_STATE that would be "PENDING_TRANSFER_OUT". I hope this makes things a bit easier to understand.

EDIT 2

So now i'v gotten som help that has been great, but im not sure why this code will not work. It complains when i try to use the enumList.values()? This is the reason i couldnt find a solution in the first place, what am i missing? =)

    public String CalculateDropdownListWidth(Enum enumList){
        int chars = 0;
        for(Enum e : enumList.values()){
            //do stuff
        }
}

FINAL:

So now i knwo why this didnt work. I hade to loop over a EnumSet instead of a Enum. Since the Enum is only one in the "set" if im not totally misstaken. So this is my solution. Thanks all for helping out!

public String CalculateDropdownListWidth(EnumSet enumList){
    int chars = 0;
    for(Object e : enumList){
        if(e.toString().length() > chars){
            chars = e.toString().length();
        }
    }

    //Pixelmodifier
    Double oneChar = 1.35;

    Double result = oneChar * chars;

    return String.valueOf(result) + "px";
}

Thx for any help!

/Marthin

Don't need the `getDomainLanguages`. There's a method `values()` defined for every `enum` which returns an array of values. — Boris Pavlović, Apr 11 '11 at 13:25
I don't see any Strings. Do you mean the longest enum literal, like `PENDING_TRANSFER_OUT` in your second enum? — Jonathon Faust, Apr 11 '11 at 13:25
I am confused, there are not strings in the above example and what does DOMAIN_STATE have to do with anything? — Andrew White, Apr 11 '11 at 13:25
@Jonathon Yes the literal is what i whant find the length of, my bad! — Marthin, Apr 11 '11 at 13:26
Has been answered here http://stackoverflow.com/questions/425988/maximum-method-name-length/426008#426008 — Boris Pavlović, Apr 11 '11 at 13:27

Ralph · Accepted Answer · 2011-04-11T13:42:15.507

5

 String longestYet= "";
 for (Enum<?> value :OfferType.values()){
     if (longestYet.length()< value.name().length()) {
        longestYet= value.name();   
     }                
 }
 longest = longestYet;

If you need this value very often for a specific enum, then you can add it to the enum itselve, and set the value in a static initialialzer.

public static enum MyType {

    NORMAL,
    OTHER;

   public static final String longest; 
   static{
        String longestYet= "";
        for (Enum<?> value :MyType.values()){
           if (longestYet.length()< value.name().length()) {
            longestYet= value.name();   
           }                
        }
        longest = longestYet;
    }        
}

or even better, put the static initializer method, in a Util function that can be reused in several Enums.

edited Apr 11 '11 at 13:42

answered Apr 11 '11 at 13:26

Ralph

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2

It is clear in the question if what is wanted is the enum literal or it's length, though. – Edwin Dalorzo Apr 11 '11 at 13:28
This puts a smile on my face. :) – mre Apr 11 '11 at 13:30
Thank you, this has helped alot but for some reason i still cant get it working. Please check my last edit. – Marthin Apr 11 '11 at 13:42
@Ralph: I have, it didnt work, I think there might be some problem with the enumList i send in? CalculateDropDownList(Enum> enumList) – Marthin Apr 11 '11 at 13:56
@Marthin: What is the exact problem: exact source code and exact exception/compiler error? – Ralph Apr 11 '11 at 14:02
@Found the problem, need to use EnumSet and loop over objects. Thx for the help! See finaledit for my final code =) – Marthin Apr 11 '11 at 14:02

score 1 · Answer 2 · answered Apr 11 '11 at 13:27

1

You can do YourEnum.values() then iterate through all and get the length of the string returned by name().

answered Apr 11 '11 at 13:27

Thomas

87,414
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score 0 · Answer 3 · answered Apr 11 '11 at 13:25

0

Iterate over DOMAIN_LANGUAGES.values and find the longest name.

answered Apr 11 '11 at 13:25

Edwin Dalorzo

76,803
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java get the longest string in enum

3 Answers3